FSO Wifi - can ping but cannot download
macebre at web.de
Mon Aug 4 18:40:24 CEST 2008
Am Mo August 4 2008 15:20:38 schrieb Dylan Semler:
> On Mon, Aug 4, 2008 at 6:18 AM, Andy Green <andy at openmoko.com> wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> > Somebody in the thread at some point said:
> > | Andy Green escreveu:
> > |> Somebody in the thread at some point said:
> > |> | I've configured WiFi on a fresh FSO image the same way I had on a
> > 2008.2
> > |> | image--by creating a wpa_supplicant.conf file and editing
> > |> | /etc/network/interfaces. This configuration worked on the 2008.2
> > image
> > |> | but when I try implementing it on an FSO image, I cannot download
> > |> | anything. I can ping sites and when using wget, I can connect to
> > them,
> > |> | but downloading never commences. It's not a DNS issue because ping
> > and
> > |> | wget seem to be able to resolve correctly. Any thoughts?
> > |>
> > |> Sounds specific to tcp transport, ping is ICMP and DNS usually UDP.
> > |> Maybe connect to a local Linux box and run tcpdump on there to study
> > |> what it sees from the connection action.
> > |
> > | No, it's not "ping and DNS do not use TCP". It's "ping and DNS and TCP
> > | SYN are small packets, data transfer is large packets", i.e. PMTU
> > | blackhole. I've seen that thing happen way too many times, and the
> > | workaround is almost always a MSS clamp (which is an ugly but
> > | unfortunately necessary hack).
> > Well, he says it worked on some other image.
> > The guy can test this by seeing if he has any bulk transfer with local
> > machines on his side of his router.
> > He can also mess with his ping payload size and confirm if that controls
> > the issue...
> > # ping -s 4096 192.168.0.1
> > PING 192.168.0.1 (192.168.0.1) 4096(4124) bytes of data.
> > 4104 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=5.36 ms
> I can wget files hosted on the local side of the router, cannot wget
> anything external. ping -s 4096 192.168.1.1 still works.
hi had the same problem with the ASU image. Another (second or
third?) "udhcpc" in the Terminal did it for me.
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